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प्रश्न
Why does menstruation occur?
उत्तर
Menstruation is a process in which blood and mucous flow out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilised egg. Thus, the inner lining of the uterus gets thickened and is supplied with blood to nourish the embryo. If the egg does not get fertilised, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous from the vagina. It lasts for three to five days.
APPEARS IN
संबंधित प्रश्न
Given here is a section of the female reproductive system of human beings.
Name the parts labelled 1 to 4
Differentiate between:
Implantation and pregnancy
Name two hormones secreted by ovary of female reproductive system.
Name the following:
The part of the female reproductive system in which fertilization occurs.
Complete the following statement by choosing the correct alternative:
Menstrual flow is a character is the feature of ______.
Give the functions of the following:
Penis
The below diagram represents the vertical view of the human female reproductive system.
(i) Label the parts indicated by the guidelines 1 to 8.
(ii) How does the uterus prepare for the reception of a zygote?
(iii) What happens to the uterus if fertilization takes place?
(iv) What happens to the uterus if fertilization has failed to take place?
Name the Following
The term used for the mature follicles.
Name the Following
A cellular sac containing maturing egg.
Name the Following
The hormone that stimulates the contraction of the uterus during childbirth.
Give Technical Term:
What term is used for the arrest of reproductive capacity in females?
Complete the following sentences with appropriate word:
The female equivalent of the penis is the _______.
Write the functional activity of the following structure:
Graafian follicle
Match the parts of the given figure with the correct option.
| 1 | 2 | 3 | 4 | 5 | |
| a. | Fallopian tube | Oviduct | Uterus | Cervix | Vagina |
| b. | Oviduct | Cervix | Vagina | Ovary | Vas deferens |
| c. | Ovary | Oviduct | Uterus | Vagina | Cervix |
| d. | Fallopian tube | Ovary | Cervix | Uterus | Vagina |
What is true of gametes?
Name the part of the human female reproductive system where the following occurs.
Fertilization
Contraction of which muscles are responsible for causing labour during parturition?
Penis is homologous to ____________.
Which of the following statements regarding human reproduction is INCORRECT?
The development of lactiferous tubules during pregnancy is dependent on ____________.
Identify the layer of the uterine wall that undergoes changes during menstrual cycle.
Which one the following is a part of external genitalia of a female human being?
Which of the following is a finger like structure and lies at the upper junction of the two labia minora above the urethral opening?
Extra-embryonic membranes of the mammalian embryo are derived from ______.
The opening of the vagina is often covered partially by a membrane called ______.
The finger-like projections, called fimbriae, help in the collection of ovum into the fallopian tube following ovulation.
When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients?
What marks the beginning of the reproductive life of a woman?
In human females, an event that reflects onset of reproductive phase is
Which among the following is not the function of testes at puberty?
- formation of germ cells
- secretion of testosterone
- development of placenta
- secretion of estrogen
Mother gives birth to a baby but the baby has characters of both parents. How is this possible?
______ acts as a birth canal.
Explain how the uterus and placenta provide necessary conditions for proper growth and development of the embryo after implantation?
List two roles of the Oviduct in the human reproductive system.
The ______ is also called the womb.
Clitoris is equivalent to the male penis.
Write the specific location of the following:
Vagina
Distinguish between the following pair:
Spermatogenesis and oogenesis
The figure given below is the human female reproductive system. Study the same and answer the following questions.
 |
- Label the guidelines 1 to 6 shown in the figure.
- What is the normal gestation period in human?
- Where are the sperms released during coitus?
- Write two important functions of part 2.
- Mention the technical term for the fixing of developing zygote to the uterine wall.
